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  #31  
Old 04-29-2010, 09:31 AM
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jsharkey jsharkey is offline
 
Join Date: Nov 2006
Location: Bennington, Vermont USA
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Originally Posted by Airhead View Post
Thanks Jim, you made it easy. I googled McMaster as you suggested and cut and pasted the part numbers and presto, compiled an order. Total current price $15.90. I think I'll try the springs and then see if I can thread 3/16" brass rod.
Pleased to help
Jim Sharkey
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  #32  
Old 04-12-2017, 04:32 PM
PG13 PG13 is offline
 
Join Date: Apr 2017
Location: Fresno
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Still looking for pics of the spring installation. Thanks!
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  #33  
Old 04-12-2017, 04:59 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
Default I tested the bolt mod alone.

I just used the long bolts on my 7. I tested with 1 psi air pressure at the inlet to the master cylinders and ensured that it always flowed when returned. The pedals were worked until floppy loose then tested. The plunger always returned no matter how slowly it was pressed and/or released.

Maybe with age the springs will be needed. They are in my stock now, along with the collars. I don't like the fact that the springs will rub the shaft.
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  #34  
Old 04-12-2017, 07:23 PM
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rzbill rzbill is offline
 
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Location: Asheville, NC
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Bill,
If you spend some time correcting some of the deficiencies in all of the pivot locations, the springs are not needed.

1) The long bolt mod for the pedals.
2) Get rid of the washers called out in the design for use as spacers for the master cylinders. Fabricate some one piece bosses and permanently mount them to the pedals so that the lower pivot bolt has plenty of bearing surface and can't tilt sideways if left loose enough to act like a pivot.

I had some aluminum body nylock nutplates that worked perfect as material to make the bosses. Drilled them out, filed them a bit shorter and riveted to the rudder pedal.

600 hrs, Never a problem with cylinder return. No springs.

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Last edited by rzbill : 04-13-2017 at 03:57 AM.
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  #35  
Old 04-12-2017, 08:23 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Quote:
Originally Posted by PG13 View Post
Still looking for pics of the spring installation. Thanks!
Measure the shank diameter of the master cylinder.

Measure the space from the body to the lowest spot a spring could fit and deduct 1/2 to 3/4 of an inch.

Go to your ACE hardware or any other hardware store and look at springs that will fit over the shaft. They do not need to be very strong..... easy squeeze with your fingers.

Get (still at the hardware store) allan screw locking collars with the ID to fit the shank.

Disconnect the master cyl. from the pedal, slide on the spring, slide on the collar, compress the spring the thickness of the collar and tighten the set screw.

Replace bolt.....Done.
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  #36  
Old 04-12-2017, 09:50 PM
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bruceh bruceh is offline
 
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Location: Ramona, CA
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Quote:
Originally Posted by PG13 View Post
Still looking for pics of the spring installation. Thanks!
Here you go.



You can't see the nylon washer at the bottom of the springs, but there is one there. Then the springs go over the push rods, and are held down with a shaft collar and set screw.

I sourced all of these parts at the local hardware store.

I used stainless steel drill rod to make the "long bolts". Cut to size, used a die to thread the ends, then drilled a hole for a cotter pin and used castellated nuts.

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  #37  
Old 04-13-2017, 06:26 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by rzbill View Post
Bill,
If you spend some time correcting some of the deficiencies in all of the pivot locations, the springs are not needed.
[/IMG]
Thanks, Bill, love the boss implementation!

I just used the washers and it worked, but will look for some boss material. Maybe some left over bar stock will work, just turn it on the lathe.

Great idea, Thanks!
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RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #38  
Old 04-13-2017, 09:37 AM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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I just finished this step in my build. I did use a 12" #12 bit to make sure the pedals rotated freely on the long bolt.

I noticed that the tabs for the master cylinders may need to be adjusted a little so that the are aligned properly. Otherwise there was some additional resistance.

I went ahead and ordered the springs and etc. from McMaster. Cheap insurance in my mind. PM me and I can send you 4 springs. They are sold in bags of ten. Oh and if you want nylon washers I have those too. I didn't like the shoulder bushing setup called out in a related thread where the 0.5" diameter spring rested on the end of the shoulder bushing.
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  #39  
Old 04-20-2017, 10:08 PM
PG13 PG13 is offline
 
Join Date: Apr 2017
Location: Fresno
Posts: 18
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My only issue with the parts from McMaster that were listed, and that I ordered, is the ID of the spring is basically the same as the OD of the sleeve so the spring doesn't fit over the sleeve. Are people unwinding the spring a bit to fit it over the sleeve? or did I order this wrong? I just copied earlier posts but the spring and sleeve are the same diameter.

https://photos.google.com/share/AF1Q...1MbTE2VldraDhR
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  #40  
Old 04-21-2017, 07:39 AM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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Yeah I didn't like the way that fit either. Unfortunately I just blindly ordered the parts listed and didn't check any of the dimensions first. I did subsequently order slightly larger diameter spring and I found some other sleeves that had a slightly smaller OD. I'll see how those parts look and fit tomorrow.
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2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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